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F. 0. HOAGLAND.

BARREL STRAIGHTENING MECHANISM.

APPLICATION FILED OCT. 31.19!!- Patented Dec. 2,1919.

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FRANK 0. HOAGLAND, OF HARTFORD, CONNECTIOUTfASSIGNOR TO PRATT & WHITNECOMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY. v

' BABREL-STRAIGHTENING MECHANISLI.

Specification of Letters Patent;

Application filed October 31, 191%. Serial 110.19%),419.

To all whom it may concern: I I,

Be it known that I, FRANK g0. Hoaenann, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inBarrel- Straightening Mechanism, of which the following is aspecification. V y p ,This invention relates to a mechanism which isadapted to beused for straighteningthe bores of gun barrels.

The principal object of the invention is to provide'a mechanism whichreadily enables the operator to take into account. and compensate forthe character of the curvature which he finds in the gun barrel. Themachine is adapted to be readily adjusted to straighten relatively shortsharp curvatimes or to straighten relativelylong gradual curvatures.Other objects of the inven-' tion will be apparent from the followingspecification and claims.

The invention can be embodied in any one of a large number of ways andinthe accompanying drawing I have shown a rela tively simple embodimentwhich is entirely suitable for performing accurate work. It will beunderstood, however, thatthe drawing is intended to be merelyillustrative and is not to be understood as defining or limiting thescope of the invention, the accompanying claims being relied upon forthat purpose. I

Of the drawings Figure 1 is a front elevation with certain parts brokenaway and shown in section.

Fig. 2 is a vertical sectional view taken along the line 22 of Fig. 1.

8 is a detail view of the adjusting mechanism, this view being takenfrom the right-hand side of the machine.

I Fig. 4: is a detail sectional view taken along the line 44 of Fig. 3.

Referring to the drawing, 1 represents the base or pedestal upon whichthe other parts are supported. Mounted on the base or pedestal is aframe member 2 which is provided at 3 with an anvil having a horizontaltop face. The anvil is provided with a longitudinal groove 4: in whichare slidably fitted two shoes 5 and 6. These shoes are adaptedto supportthe gun barrel which is to be straightened.

For applying pressure to the barrel in the" Pate'ntedDec. 2, 1919.

7 which is preferably secured to or formed integrallywith a verticallythreaded rod 8.

This rod 8 fits a vertical nut 9 which is rotatable in a bearing in theupper part of the frame member 2. For turning the nut Q there isprovided a bevel gear wheel 10 which is preferably formed integrallywith the nut,'as shown. This bevel gear 10 meshes with a bevel gear 11on a horizontal shaft 12 which is rotatable in a bearing in the framemember 2. At the outer end of the shaft 12 is a hand wheel '13 by meansof which the shaft may be readily turned manually. Itwill be clear.that,by means of the hand wheel, the nut 9 can be turned to raise or lowerthe plun er? by means of the threaded connection etween the nut andtherod 8.

Preferably, in order to prevent thefrod 8 from turning with the nut 9,there is provided a clip 14: which is secured to the frame member 2 andwhich carries at its inner end a key 15- projecting into a keyway 16 inthe rod In order that the mechanism may 'be adapted for thestraightening of either short sharp bends in a barrel or long gradualbends, the two shoes 5 and. 6 are adjustable towardand away from theplunger .7. It is essential that the two shoes be maintained at equaldistances from the plunger, or in other words, it is essential that theplunger be at all times midway between the two shoes. I provide anequalizing mechanism whereby I insure the movement of the two shoes toequal extents in opposite directions. As concerns certain phases of theinvention, I do not limit myself to any particular form of mechanism forthis purpose, but I prefer to provid ajshaft 17 which extends parallellywith the groove 4 in the anvil 3. At the center below the plunger 7 theshaft 17 extends through a block 18 which is held against longitudinalmovement. At each side of the block the shaft is provided with blockhold the shaft against longitudinal movement. The two end parts of theshaft 17 extend respectively through the shoes 5 and 6 and are providedwith similar but oppositely inclined threads which are preferably ofsharp pitch. Secured to the shoes 5 and 6 and engaging the ends of theshaft 17 are nuts 20 and 21. It will be clear that any rotative movementof the shaft 17 will cause the two shoes to move outward or inward tothe same extent, thus maintaining them at equal distances from theplunger. Preferably the pitch of the threads on the shaft 17 is suchthat either shoe may be moved manually to impart a rotative movement tothe shaft and thus move the other shoe in the opposite direction.

Under some circumstances I prefer not to depend solely upon one or theother of the shoes for imparting rotative movement to the shaft 17. Itis sometimes desirable to provide a separate mechanism for this purposeand such a mechanism is illustrated.

As shown, the anvil 3 carries at its righthand end a bearing block 22and the shaft 17 is extended to have a bearing in this block. Secured tothe end of the shaft 17 is a pinion 23. A segemental gear 24: mesheswith the pinion 23 and is mounted on a pivot pin 25 which has a bearingin the block 22. The segmental gear 2st carries a handle 26 by means ofwhich it may be turned. It will be clear that the operator, by movingthe handle 26, can turn the shaft 17 and thus move the shoes 5 and 6 ineither direction and to any desired extent, at the same time maintainingthem at equal distances from the central plunger 7.

The errors of the barrel to be straightened can be determined in anyusual or preferred way. If preferred, a special mechanism may beprovided for ascertaining these errors, or they may be noted by sightingthrough the barrel in the well known manner. The mechanism asillustrated is particularly adapted for use with the sighting method andfor the convenience of the operator in sighting I have provided a rest27 upon which the end of the barrel can be supported. Preferably, asshown, this rest is at an elevation somewhat above that of the shoes soas to support the barrel at an elevation which is convenient for theoperator. The operator supports one end of the barrel on the rest 27 andobserves the direction of the curvature and also observes whether it islong or short. He adjusts the shoes 5 and 6, preferably by means of thehandle 26, in accordance with the length of the curve. Then he placesthe barrel on the shoes and turns it to the proper position. By turningthe hand wheel 18 he moves the plunger downward into engagement with thebarrel and applies the required pressure to straighten it. Thisoperation is repeated until all of the curvatures of the barrel havebeen removed and it 18 straight throughout.

It is sometimes desirable to slightly in-.

. pedestal is forked and a depending portion of the frame member ispositioned between the two forks. A pivot pin 28 extends through theseparts and the frame member with the parts carried thereby may beadjusted on this pivot pin. After adjustment the nut 29 on the pin maybe turned to clamp the two forks of the pedestal against the framemember and thus lock the frame member in adjusted position.

What I claim is:

1. in a machine for straightening gun barrels, the combination of abase, a frame carried by the base and having a horizontal recess thereinopen at one side, two barrel engaging shoes positioned at the bottom ofthe recess, a plunger projecting into the recess from the top andvertically movable along a line midway-between the shoes andintersecting the axis of a barrel on the shoes, a manually operabledevice at the rear of the frame opposite the open side of the recess formoving the plunger to apply to the barrel any pressure that the operatormay deem necessary, and manually operable means for moving the shoestoward or from each other while automatically maintaining themequidistant from the plunger.

2. In a mechanism for straightening gun barrels, the combination of abase, a frame carried by the base and having a horizontal recess thereinopen at one side, two barrel engaging shoes positioned at the bottom ofthe recess, a plunger projecting into the recess from the top andvertically movable along a line midway between the shoes andintersecting the axis of a barrel on the shoes, a manually operabledevice at the rear of the frame opposite the open side.

of the recess for moving the plunger to apply to the barrel anypressurethat the operator may deem necessary, an oppositely threadedlongitudinal shaft for moving the shoes toward or from each other whileautomatically maintaining them equidistant from the plunger, and ahandle at one end of the frame adjacent the recess for turning theshaft.

3. In a mechanism for straightening gun barrels, the combination of abase, a frame carried by the base and having a horizontal recess thereinopen at once side, two barrel engaging shoes positioned at the bottom ofthe recess, a plunger projecting into the recess from the top andvertically movable along a line midway between the shoes andintersecting the axis of a barrel on the distant from the plunger, and abarrel rest shoes, a manually operable deviceat the rigidly secured tothe frame adjacent the top 10 rear of the frame opposite the open sideof of the recess whereby the operator may supthe recess for moving theplunger to apply port the barrel for convenience in sighting.

any desired pressure to the barrel that the In testimony whereof, Ihereto afiix my operator may deem necessary, means for signature.

moving the shoes toward or from each other While automaticallymaintaining them equi- FRANK O. HOAGLAND.

